JP5586861B2 - Ophthalmic imaging system and ophthalmic imaging apparatus - Google Patents

Description

The present invention is, for example, used in ophthalmic clinics and group medical examination, etc., to a ophthalmic imaging system and ophthalmologic photographing apparatus for processing image obtained by photographing a subject's eye.

  As an ophthalmologic photographing apparatus, a fundus camera that performs fundus photographing of an eye to be examined is known. In addition, the fundus camera observes the eye to be inspected, and has multiple imaging modes such as color imaging, visible fluorescence imaging (fluorescence G imaging), and near infrared fluorescence imaging (ICG imaging) for imaging in accordance with the examination purpose. Devices having such are known.

  An apparatus that automatically sets gain, gamma, color temperature, and the like, which are parameters of a TV camera to be mounted, according to the plurality of shooting modes is disclosed in Patent Document 1. Further, Patent Document 2 discloses an apparatus that performs image processing with optimum processing parameters corresponding to a plurality of shooting modes.

  The optimal processing parameter here is a color image that is originally greenish when photographing the fundus of the eye to be examined, but it is converted to a black and white image for ease of interpretation, and further, gamma characteristics, contrast, etc. The tone conversion process is performed. Similarly, in the case of near-infrared fluorescence photography, diagnosis is generally performed by performing gamma characteristics and contrast processing.

JP 2001-245851 A JP 2004-187811 A

  Conventionally, in an ophthalmologic photographing apparatus having a plurality of photographing modes, (1) a raw image captured immediately after photographing is subjected to image processing with optimum processing parameters, and interpretation is performed using a compressed image; There are two methods of holding all images and performing interpretation.

  However, when interpretation is performed by the method (1), the lesion site becomes difficult to see due to lack of gradation information such as color and density, and in the worst case, the lesion may be overlooked. In the method performed in (2), the gradation information is not insufficient, but the image data has become enormous due to the recent increase in the resolution of the image sensor, and the load on the apparatus is increased due to a decrease in processing speed and an increase in recording data. , It becomes unusable.

An object of the present invention is to provide an ophthalmologic photographing system and an ophthalmologic photographing apparatus capable of solving the above-mentioned problems and improving the interpretation accuracy without impairing the usability of the apparatus.

In order to achieve the above object, an ophthalmologic photographing system according to the present invention comprises:
A selection means for selecting one of a plurality of imaging modes with different imaging conditions for imaging the eye to be examined;
Imaging means for imaging the eye to be examined in the imaging mode selected by the selection means;
When the color photographing mode is selected by the selecting means, the image data of the eye to be examined photographed in the color photographing mode is compressed, and image data giving priority to gradation resolution over spatial resolution is generated from the image data When the fluorescence imaging mode is selected by the selection means, the image data of the eye to be examined captured in the fluorescence imaging mode is compressed, and image data giving priority to spatial resolution over gradation resolution from the image data Generating means for generating.

According to the ophthalmologic photographing system according to the present invention, it is possible to optimize the subsequent image processing by optimizing the spatial resolution and gradation resolution of the base image data of the eye to be examined according to the photographing mode. Can improve the accuracy of interpretation. In addition, by appropriately compressing redundant data that is unnecessary depending on the shooting mode, the usability of the apparatus is not impaired. Furthermore, as the final diagnostic image, the basic image data in the shooting mode is easily handled by subsequent image processing and is converted to a gradation resolution suitable for the gradation expression of the monitor. , Unified handling becomes possible.

It is a block diagram of an ophthalmologic photographing apparatus. It is a block circuit block diagram. It is explanatory drawing of the example of interpretation of diabetic retinopathy. It is explanatory drawing of the interpretation example of glaucoma. It is explanatory drawing of image data.

  The present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 is a block diagram of an ophthalmologic photographing apparatus including a fundus camera, and includes a fundus camera 1 and a personal computer 2 for image processing and file management. The fundus camera 1 is provided with a digital camera 11 having an imaging means such as a CCD inside and generating digital base image data, a photography start means 12 comprising a switch, and a photography mode selection means 13 comprising a switch. Yes. The personal computer is provided with an image display unit 21 such as a monitor. Although not shown, the fundus camera 1 is provided with members such as an illumination optical system and a photographing optical system for photographing the eye to be examined, a filter according to a photographing mode, an observation light source, and a photographing light source. .

  Two communication paths 3 and 4 are used between the fundus camera 1 and the personal computer 2. The communication path 3 is for data transfer, and the base image data S 1 is output from the digital camera 11. . Shooting information S2 is output from the fundus camera 1 using the communication path 4, and a shooting permission signal S3 indicating that a shooting operation is possible is output from the personal computer 2.

  FIG. 2 is a block circuit configuration diagram of the embodiment. The fundus camera 1 includes a fundus camera control unit 14, a shooting information management unit 15, and an image generation detection management unit 16, in addition to the digital camera 11, the shooting start unit 12, and the shooting mode selection unit 13. The fundus camera control unit 14 controls the fundus camera 1, and the image generation detection management unit 16 detects that the base image data is generated by the digital camera 11. Further, inside the digital camera 11, an image sensor 17 such as a CCD, a digital camera control unit 18 that controls the digital camera 11, and a base image data generation unit 19 that generates base image data of the digital camera 11 are provided. Yes.

  In the personal computer 2, an image processing unit 22, a shooting information storage unit 23, a file storage unit 24, a shooting condition information input unit 25, and an image editing unit 26 are provided. The image processing unit 22 performs image processing mainly for executing gradation processing on the base image data output from the base image data generation unit 19, and the shooting information storage unit 23 is a shooting information management unit of the fundus camera 1. The shooting information output from 15 is stored in the file storage unit 24. The file storage unit 24 stores an image file with imaging information, and the imaging condition information input unit 25 inputs imaging condition information such as a patient name and an imaging location.

  By providing a basic image data generation unit 19 integrally with a general digital camera, using a PC as the image processing unit 22, and connecting the two with data transfer means to form a device, a cheaper and simpler system is provided. can do. In addition, it is possible to quickly display an image after shooting without unnecessarily extending the data transfer time at this time.

  When a patient to be photographed is determined, the personal computer 2 uses the photographing condition information input unit 25 to select a patient, confirm patient information, and the like. Next, an imaging permission signal S3 is output via the communication path 4 in order to enable imaging when the information for the patient is confirmed. The fundus camera 1 can be operated by the output of the photographing permission signal S3.

  In this state, the shooting mode selection means 13 selects the shooting mode. In this embodiment, there are a color imaging mode and a fluorescence (visible fluorescence angiography) imaging mode as imaging modes. After selecting the imaging mode, an alignment operation and a focus operation are performed on the eye to be examined. When the imaging region is determined, the operator operates the imaging start unit 12 of the fundus camera 1 to perform fundus imaging. The fundus camera 1 emits a photographing light source according to a photographing synchronization signal from the digital camera 11 in response to an input from the photographing start means 12.

  First, in the color photographing mode, the examiner selects the color photographing mode by the photographing mode selecting means 13. By this operation, the fundus camera control unit 14 changes the filter for color photographing. When shooting is performed, the base image data generation unit 19 in the digital camera 11 performs pixel addition or the like that reduces the spatial resolution while maintaining the gradation resolution of the captured original image, for example, 12 bits · 3 (RGB) of the original image. Execute the process. Furthermore, basic image data S1 subjected to lossless compression is generated as necessary.

  Thereafter, the basic image data S1 is transferred to the image processing unit 22 of the personal computer 2 through the communication path 3. The transferred base image data S1 is subjected to gradation conversion in accordance with each photographing mode, and finally, gradation resolution suitable for the image display unit 21, for example, generally for 8-bit / 3 color diagnosis. An image is generated and displayed on the image display unit 21. The image processing process performed here is the first process.

  After that, the image is associated with the base image data S1, the photographing condition information input unit 25, and the photographing related information of the photographing information storage unit 23, and is stored in the file storage unit 24. That is, the file stored in the file storage unit 24 stores both the diagnostic image and the base image data S1 having gradation information similar to the 12-bit gradation information of the original image.

  Thus, it can be said that the characteristic control in the color photographing mode is a process of compressing the spatial information while keeping the gradation information performed by the base image data generation unit 19 as the original image. In color photography, the spatial frequency band of an image is narrower than monochrome photography in which filter photography is performed in a narrower illumination wavelength band, such as fluorescence photography and red-free photography, due to chromatic aberration in the photographing optical system.

  The color imaging mode for obtaining color diagnostic images with a narrow spatial frequency band of the image is a gradation resolution rather than a spatial resolution compared to monochrome photography such as fluorescent photography and red-free photography where filter photography is performed in a narrower illumination wavelength band. Base image data with higher priority is generated. Thereby, it is possible to appropriately compress redundant spatial data, and it is possible to handle the base image data maintaining higher gradation resolution in the subsequent image processing. Therefore, appropriate gradation processing can be performed for gradation expression with a wide dynamic range of the nipple and macula on the fundus.

  FIG. 3A is a specific example of image processing in interpretation in the color photographing mode, and shows an example of interpretation of diabetic retinopathy of the fundus, which is output to the image display unit 21 by the first processing after performing color photographing. The rendered image is shown. As a result, the blood vessel has a greater difference in brightness and lightness than the surrounding area, so that the identification is easy.

  However, when interpreting small bleeding spots in the part a, it is effective to emphasize differences in luminance and brightness of the part of interest. The enhancement processing is executed by the image editing unit 26 using the base image data file stored in the file storage unit 24. By performing the enhancement process, the image shown in FIG. 3B is obtained, and small bleeding spots can be interpreted as in the region b. In this embodiment, since the base image data file records the gradation information as it is as the original image, such detailed interpretation is possible.

  FIG. 4 shows an example of interpretation of glaucoma, and FIG. 4A shows an image output to the image display unit 21 by the first processing as in FIG. In FIG. 4A, the state of the sieve-like plate of the nipple c necessary for grasping the defect of the retinal optic nerve fiber bundle is grasped because the gradation resolution is insufficient and the dynamic range of the display element is insufficient. It is not possible.

  However, the gradation conversion processing image editing unit 26 performs gradation conversion processing capable of expressing the sieve plate in the nipple on the base image in which gradation resolution is maintained, so that FIG. A large gradation can be rendered as in the nipple portion d of b). As described above, in the case of a color image, the gradation information is recorded as it is, so that the detailed diagnosis can be performed by the image editing process for the color and gradation.

  Other image processing, such as underexposure and cataracts, where the brightness and brightness are low and the fundus image has many dark areas, enhancement processing and noise removal processing, and fundus images that did not become natural due to differences in the pigment in the fundus There is a useful image editing process such as a color correction process.

  In the fluorescence imaging mode as an example of a monochrome image, the examiner selects the fluorescence imaging mode by the imaging mode selection means 13. In response to this operation, the fundus camera control unit 14 controls the filter for fluorescence imaging. When shooting is performed, the base image data generation unit 19 in the digital camera 11 executes gradation conversion according to the color reduction processing and the fluorescence shooting mode. Color reduction processing and gradation conversion are performed to reduce the gradation resolution from, for example, 12 bits · 3 (RGB) to 8 bits monochrome while maintaining the spatial resolution of the captured original image, for example, 10 M pixels.

  Further, the base image data S1 subjected to irreversible compression of the file, for example, JPEG compression, is generated as necessary. Thereafter, the base image data S1 of the digital camera 11 is transferred to the image processing unit 22 of the personal computer 2 through the communication path 3. The image data transferred to the image processing unit 22 is restored as necessary.

  The restored image data has already been finally reduced to a gradation resolution suitable for the image display unit 21, for example, 8 bits monochrome for fluorescence, and appropriate gradation processing has been performed. Is displayed on the image display unit 21. Thereafter, the image is stored in the file storage unit 24 together with the imaging related information of the imaging condition information input unit 25 and the imaging information storage unit 23.

  Compared to the above-mentioned color photography, base image data that gives higher priority to spatial resolution than gradation resolution corresponding to the spatial frequency band of the image that is enlarged during monochrome photography that performs filter photography in a narrower illumination wavelength band It is possible to generate and compress the data appropriately. This compression is also effective for high-speed continuous shooting in fluorescent photography.

  In the fluorescence imaging mode, the purpose is to perform angiography with a fluorescent agent, and the high-contrast and fine blood vessel image created by the fluorescent agent occupies most of the image, so spatial resolution corresponding to the spatial frequency band of a wideband image is required. It is. On the other hand, since the contrast is sufficiently high, sufficient gradation expression can be performed by the unique gradation conversion performed by the base image data generation unit 19, and conversion into a monochrome image for the purpose of easy interpretation. Is also done.

  That is, in this fluorescence imaging mode, the data can be appropriately compressed by generating basic image data in which the spatial resolution is given priority over the gradation resolution by the second processing. For the same reason, the image processing unit 22 generally does not need to perform special gradation conversion. Of course, appropriate gradation processing can be re-executed according to the user's preference, the amount and type of the fluorescent agent, and the conditions specific to the examiner's preference.

  FIG. 5A shows image data obtained by the first processing in this embodiment. The size of each part indicates a data capacity, and the image X0 is an original image captured by the image sensor 17, that is, electronic data itself. The image X1a is basic image data generated by the basic image data generation unit 19 in the digital camera 11 during color photographing. The original image X0 is obtained by reducing the spatial resolution by a process such as pixel addition while the gradation resolution is, for example, 12 bits · 3 (RGB) of the original image, and further performing reversible compression as necessary. Therefore, the image X1a is smaller than the image X0 in terms of the data amount.

  The image X1a of the digital camera 11 is transferred to the image processing unit 22 of the personal computer 2 through the communication path 3. This communication time is governed by the data capacity of the image X1a when the communication speed is constant. The response and usability of the apparatus depends on the data capacity of the image X1a, and it is important to optimize this capacity.

  The image X2a is subjected to gradation conversion in accordance with each photographing mode, and finally has a gradation resolution suitable for the image display unit 21 such as a monitor, for example, a diagnostic electronic image generally having a color of 8 bits / 3. It is. This image X2a becomes an image X3a stored in the file storage unit 24 together with the photographing related information after irreversible compression of the file such as JPEG. However, since the shooting-related information has a very small data amount with respect to the image data, it may be considered that the data capacity of the image X3a is further reduced by capacity compression by irreversible compression compared to the image X2a.

  On the other hand, FIG. 5B is an explanatory diagram of a method for recording gradation information as it is in an original image in a conventional apparatus. The base image data image X1b generated by the base image data generation unit 19 in the digital camera 11 remains the original image in both gradation information and spatial information.

  Accordingly, the image X1b is equivalent to the image X0 in terms of data amount. The image X2b is subjected to gradation conversion in accordance with each photographing mode, and finally has a predetermined gradation resolution suitable for the image display unit 21, for example, diagnosis electronics having generally (RGB) of 8 bits · 3. It is an image. The image X2b becomes the image X3b stored in the file storage unit 24 together with the photographing related information thereafter, as in FIG.

  However, such an apparatus is required to handle a large amount of data such as the image X1b when performing image data transfer or image processing, resulting in a system load and poor usability.

  FIG. 5C is an explanatory diagram regarding the conversion of image data in the fluorescence imaging mode according to the second process of this embodiment. The size of each part in FIG. 5 (c) indicates the data capacity as in FIGS. 5 (a) and 5 (b). Here, as described in the description of the fluorescence imaging mode, The gradation conversion according to the fluorescence photographing mode is executed. The base image data generation unit 19 in the digital camera 11 maintains the spatial resolution of the captured original image X0 as the original image, for example, the total number of pixels is 10 M pixels, and the gradation resolution is changed from, for example, 12 bits · 3 (RGB) to 8 bits monochrome. Decrease. Furthermore, when generating base image data X1c subjected to lossy compression of a file, for example, JPEG compression, if necessary, the base image data X1c transferred to the image processing unit 22 is restored. The image data X2c is obtained.

  However, since this has already been finally reduced in gradation resolution suitable for the image display unit 21 and in fluorescence, for example, 8-bit monochrome, and appropriate gradation processing has been performed, this image X2c is used as a diagnostic electronic image. It can be displayed on the display unit 21. Thereafter, the image X2c is subjected to file compression again, and is stored in the file storage unit 24 as a file X3c together with the shooting related information of the shooting condition information input unit 25 and the shooting information storage unit 23. Therefore, as described above, the image processing unit 22 generally does not need to perform special gradation conversion.

  When high-speed continuous shooting is performed as in fluorescent shooting, the system load greatly depends on the amount of data subjected to image processing. Here, since the capacity of the image X1c is smaller than that of the image X1b, it can be made smaller than the system load in the color photographing mode, and image data communication and image satisfying the speed required for fluorescent photographing. Display is possible.

  However, when this process is adopted for color photography as in the conventional apparatus, the image editing unit 26 reduces the gradation resolution of the original image X0 already captured by the base image data generation unit 19 in the digital camera 11. Processing is performed. Then, processing such as gamma correction and contrast correction is performed on the obtained image X2a, and output to the image display unit 21 is repeated. That is, in the color image processing performed here, a desired result cannot be obtained because sufficient gradation resolution is not maintained.

  To summarize the above, the system of FIG. 5A by the first processing adopted in the color photographing mode does not impair the image quality by taking advantage of the characteristics of the color fundus image by taking advantage of the defects of FIG. 5B. Image data that can reduce the system load can be generated.

  A so-called adaptive process may be performed in which a base image data input to the image processing unit is once analyzed and a process based on the result is performed on a color image that requires more detailed gradation expression. It becomes possible.

  In the first embodiment, an example is described in which the image processing unit 22 is manually executed at the time of interpretation. However, the basic image data file is analyzed, processing parameters optimum for the image are generated, and automatic processing is performed. Is also possible. Further, for example, a plurality of parameter generation methods may be prepared for each region to be emphasized or a target lesion, and the examiner can select it as necessary.

  In the fluorescence imaging mode for obtaining an image for fluorescence diagnosis that requires high-speed continuous shooting, high-speed imaging is enabled by flowing irreversibly compressed image data to the data transfer means. In the case of a lower speed, a precise diagnostic image can be obtained using reversible compression or non-compression image data in order to suppress deterioration in image quality due to compression.

  In the first embodiment described above, the fundus camera having two modes of the color photographing mode and the fluorescent photographing mode has been described as an example. The fundus camera of the second embodiment has a plurality of shooting modes having characteristics that are located between the color shooting mode and the fluorescence shooting mode, such as the red free shooting mode.

  For example, in the case of a non-red image shot in the red-free shooting mode, the required spatial resolution Sr is Sc <Sr when compared with the spatial resolution Sc required for the color image and the spatial resolution Sf of the fluorescent image. <Sf relationship. Similarly, when the required gradation resolution is Dr for a non-red image, Dc for a color image, and Df for a fluorescent image, the relationship is Dc> Dr> Df.

  Therefore, the processing performed by the basic image data generation unit 19 in the digital camera 11 on the captured original image is one in which the gradation resolution is often reduced from the original image, for example, 10-bit monochrome. Further, the spatial resolution may be set so as to execute the second process having a higher resolution than that for the color image.

  That is, by appropriately setting such second processing for each shooting mode, it is possible to adjust the load while obtaining an image that matches the characteristics of each shooting mode.

  In the first embodiment, the gradation resolution is set to the gradation resolution of the final display diagnostic image in the fluorescence imaging mode, and the gradation processing is not particularly performed after the image is transferred to the image processing unit 22. However, the gradation rendering performance can be further improved by setting the gradation resolution a little higher. Furthermore, it is also useful to set the same shooting mode so that a combination of a plurality of resolutions can be selected by the user.

  In addition, as a process to be performed on the original image captured by the base image data generation unit 19, it is possible to select a file compression type and usage method prepared as necessary as parameters. Needless to say.

DESCRIPTION OF SYMBOLS 1 Fundus camera 2 Personal computer 3, 4 Communication path 11 Digital camera 12 Shooting start means 13 Shooting mode selection means 14 Fundus camera control section 15 Shooting information management section 16 Image generation detection management section 17 Image sensor 18 Digital camera control section 19 Base image Data generation unit 21 Image display unit 22 Image processing unit 23 Shooting information storage unit 24 File storage unit 25 Shooting condition information input unit 26 Image editing unit

Claims (22)

A selection means for selecting one of a plurality of imaging modes with different imaging conditions for imaging the eye to be examined;
Imaging means for imaging the eye to be examined in the imaging mode selected by the selection means;
When the color photographing mode is selected by the selecting means, the image data of the eye to be examined photographed in the color photographing mode is compressed, and image data giving priority to gradation resolution over spatial resolution is generated from the image data When the fluorescence imaging mode is selected by the selection means, the image data of the eye to be examined captured in the fluorescence imaging mode is compressed, and image data giving priority to spatial resolution over gradation resolution from the image data Generating means for generating
An ophthalmologic photographing system characterized by comprising:   When the color photographing mode is selected by the selecting means, the generating means performs a process of reducing the spatial resolution on the image data of the eye to be examined photographed in the color photographing mode. 2. The ophthalmologic imaging system according to claim 1, wherein image data giving priority to the gradation resolution over resolution is generated.   When the generation unit selects the fluorescence imaging mode by the selection unit, the generation unit performs a process of reducing the gradation resolution on the image data of the eye to be inspected captured in the fluorescence imaging mode, The ophthalmologic photographing system according to claim 1 or 2, wherein image data giving priority to the spatial resolution over the gradation resolution is generated. Data transfer means for transferring the image data generated by the generation means from the generation means;
Image processing means for performing gradation conversion according to the photographing mode selected by the selection means for the image data transferred from the data transfer means;
The ophthalmologic imaging system according to claim 1, wherein the ophthalmic imaging system is provided.   When the image processing means selects a color photographing mode by the selecting means, the diagnostic electronic image having substantially the same gradation resolution with respect to the image data of the eye to be examined photographed in the color photographing mode The ophthalmic imaging system according to claim 4, wherein:   When the fluorescence imaging mode is selected by the selection means, the image processing means restores the image data transferred from the data transfer means, and sets the fluorescence imaging mode for the restored image data. 6. The ophthalmologic imaging system according to claim 4, wherein gradation conversion is performed according to the method. When the color photographing mode is selected by the selecting unit, the image data generated by the generating unit is reversibly compressed or irreversibly compressed,
The ophthalmologic imaging system according to any one of claims 1 to 6, wherein when the fluorescence imaging mode is selected by the selection unit, the image data generated by the generation unit is irreversibly compressed.   When the red-free photographing mode is selected by the selecting means, the generating means compresses the image data of the eye to be examined photographed in the red-free photographing mode, and from the image data in the color photographing mode The image data having a spatial resolution higher than the spatial resolution of the generated image data and a gradation resolution higher than the gradation resolution of the image data generated in the fluorescence imaging mode is generated. The ophthalmologic imaging system according to any one of 1 to 7.   A program that causes a computer to execute each function of the ophthalmic imaging system according to any one of claims 1 to 8. A selection means for selecting one of a plurality of imaging modes with different imaging conditions for imaging the eye to be examined;
Imaging means for imaging the eye to be examined in the imaging mode selected by the selection means;
When the color photographing mode is selected by the selecting means, the image data of the eye to be examined photographed in the color photographing mode is compressed, and image data giving priority to gradation resolution over spatial resolution is generated from the image data When the fluorescence imaging mode is selected by the selection means, the image data of the eye to be examined captured in the fluorescence imaging mode is compressed, and image data giving priority to spatial resolution over gradation resolution from the image data Generating means for generating
An ophthalmologic photographing apparatus comprising:   When the color photographing mode is selected by the selecting means, the generating means performs a process of reducing the spatial resolution on the image data of the eye to be examined photographed in the color photographing mode. The ophthalmologic photographing apparatus according to claim 10, wherein image data in which the gradation resolution is prioritized over the resolution is generated.   When the generation unit selects the fluorescence imaging mode by the selection unit, the generation unit performs a process of reducing the gradation resolution on the image data of the eye to be inspected captured in the fluorescence imaging mode, 12. The ophthalmologic photographing apparatus according to claim 10 or 11, wherein image data giving priority to the spatial resolution over gradation resolution is generated.   The ophthalmic imaging apparatus according to claim 10, further comprising a data transfer unit configured to transfer image data generated by the generation unit to the outside of the ophthalmic imaging apparatus. When the color photographing mode is selected by the selecting unit, the image data generated by the generating unit is reversibly compressed or irreversibly compressed,
The ophthalmologic photographing apparatus according to any one of claims 10 to 13, wherein when the fluorescent photographing mode is selected by the selecting unit, the image data generated by the generating unit is irreversibly compressed.   When the red-free photographing mode is selected by the selecting means, the generating means compresses the image data of the eye to be examined photographed in the red-free photographing mode, and from the image data in the color photographing mode The image data having a spatial resolution higher than the spatial resolution of the generated image data and a gradation resolution higher than the gradation resolution of the image data generated in the fluorescence imaging mode is generated. The ophthalmologic photographing apparatus according to any one of 10 to 14. Selecting one of a plurality of imaging modes with different imaging conditions for imaging the eye to be examined;
Obtaining image data of the eye to be examined imaged in the imaging mode selected in the selecting step;
When the color photographing mode is selected in the selecting step, the image data of the eye to be examined photographed in the color photographing mode is compressed, and image data giving priority to gradation resolution over spatial resolution is obtained from the image data. Generating and compressing the image data of the subject's eye imaged in the fluorescence imaging mode when the fluorescence imaging mode is selected in the selecting step, and giving priority to the spatial resolution over the gradation resolution from the image data Generating image data; and
A control method for an ophthalmologic photographing apparatus, comprising:   In the generating step, when the color photographing mode is selected, by performing processing for reducing the spatial resolution on the image data of the eye to be examined photographed in the color photographing mode, 17. The method of controlling an ophthalmologic photographing apparatus according to claim 16, wherein image data giving priority to the gradation resolution is generated.   In the generating step, when the fluorescence imaging mode is selected, the gradation resolution is reduced by performing a process of reducing the gradation resolution on the image data of the eye to be examined captured in the fluorescence imaging mode. 18. The method for controlling an ophthalmologic photographing apparatus according to claim 16, wherein image data giving priority to the spatial resolution over resolution is generated.   The method for controlling an ophthalmologic photographing apparatus according to any one of claims 16 to 18, further comprising a step of transferring the generated image data to the outside of the ophthalmic photographing apparatus. When the color shooting mode is selected, the generated image data is reversibly compressed or lossy compressed,
The method for controlling an ophthalmologic photographing apparatus according to any one of claims 16 to 19, wherein when the fluorescence photographing mode is selected, the generated image data is irreversibly compressed.   In the generating step, when the red-free photographing mode is selected in the selecting step, the color photographing is performed by compressing the image data of the eye to be examined photographed in the red-free photographing mode. Generating image data having a spatial resolution higher than that of the image data generated in the mode and a gradation resolution higher than that of the image data generated in the fluorescence imaging mode. 21. A method for controlling an ophthalmologic photographing apparatus according to any one of claims 16 to 20.   A program causing a computer to execute each step of the method for controlling an ophthalmologic imaging apparatus according to any one of claims 16 to 21.

Images